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A genetic mutation in the LIPH gene causes tightly curled hair that stops growing in some Japanese individuals.

Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.

Pseudofolliculitis barbae is a chronic skin condition affecting mainly African American and Hispanic individuals, caused by shaving tightly curled hair, and managed by prevention and treatment but not curable.

The boy with woolly hair nevus had thinner hair and abnormal hair follicles, which improved with treatment but worsened when treatment stopped.

Curved human hair has different structures on each side, which might cause its shape and is similar to wool.

A 17-year-old developed woolly hair nevus in adolescence, which is unusual, and over time the hair darkened and straightened slightly, but microscopic changes persisted.

Infrared and Raman imaging can non-destructively analyze hair structure and help diagnose hair conditions.

Heat damages hair, with Asian hair losing more protein than Caucasian hair.

Polymethylene wax in hair relaxers makes hair smooth and shiny with less damage.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

Growing hair follicles have high mitochondrial activity and ROS in specific regions, aiding hair formation.

Permanent waving weakens hair by altering its protein structure.

Hair in mammals likely evolved from glandular structures, not scales.

Trichohyalin and peptidylarginine deiminase type III are found together in rat hair follicles, with trichohyalin being modified after expression.

The document concludes that Loose Anagen Hair Syndrome is a benign condition where hair is thin and easily pulled out, often improving with age.

Human hair varies in structure based on curl type, with high curl hair showing the most differences.

Piedraia hortae fungi dissolve both the outer and inner layers of hair.

Corkscrew and cigarette-ash-shaped hairs in tinea capitis are caused by internal hair degradation and external resistance.

Holes in mature hair are likely caused by the removal of substances during hair care.

A new DSG4 gene mutation causes hair defects in a young girl.

A mutation in the KRT74 gene causes tightly curled hair.

The document concludes that while some hair and scalp disorders can be treated, hair loss from destroyed follicles is permanent, and damaged hair can only regrow naturally.

Proper hair care can prevent and stop hair breakage in people with acquired trichorrhexis nodosa.

Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.

Asian hair is generally straight and thick, with unique disorders and properties, and more research is needed to understand it fully.

The gene Prss53 affects hair shape and bone development in rabbits.

Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.

Thioglycolic acid mainly affects the unordered areas in hair structure.

Polisorbate 20 is not suitable for curl creams due to instability.

A new perming method is less damaging to hair and works as well as traditional methods.